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Facebook appeared to be experiencing an outage on Friday afternoon. Users attempting to log on would see either a blank screen or an error message.

This is the second time this week the popular social networking site went off the grid. Facebook suffered its longest and biggest outage in the middle of the night on Thursday as millions of users around the world found themselves unable to access their accounts for about half an hour starting at 4 a.m. ET.

The latest service disruption started at about 1:13 p.m. ET, according to downrightnow.com, a website that monitors web services. Facebook was back up by 6:00 PM ET.